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/*  Datalogging with Real Time Clock on LPC1768 
*
*    @author: Baser Kandehir 
*    @date: July 8, 2015
*    @license: Use this code however you'd like
*   
*    @description of the program: 
    
*       This program can log data that is read from RTC(real time clock) which is embedded inside LPC768.     
*   It saves the data to the LPC1768’s memory as “log.txt”. For this example program, the data is how many times the button is 
*   pressed and when it is pressed in terms of real time. It can also display the button count as 4-bit binary number using 4 leds 
*   on the LPC1768. There are two different time settings on the code. One can set the time from the terminal or manually by 
*   uncommenting the corresponding portion of code. Once the time is set, if there is a battery connected to real-time clock, 
*   RTC will continue to keep track of current time. In order not to reset the real-time to its initial value every time microcontroller 
*   is reset, it is neccessary to set the time once and delete the portion of code which sets the time and keep the rest.
*   
*    @connections:
*-------------------------------------------------------------- 
*    LPC1768 ________________Peripherals
*    Pin 13 --------> (TX) RX pin of the FTDI or Bluetooth etc.
*    Pin 14 --------> (RX) TX pin of the FTDI or Bluetooth etc.
*    Pin 20 -------->  Pull-up connected button
*    GND ----------->  GND of any peripheral
*    VOUT (3.3 V) -->  Pull-up resistor
*---------------------------------------------------------------
*
*/

#include "mbed.h"
#include "ledCounter.h"

Serial ftdi(p13, p14);               // setup terminal link
LocalFileSystem local("local");      // define local file system
DigitalIn button(p20);               // pull-up button is connected to p20
     
int count=0;                         // button count 
struct tm t;                         // current time will be stored here

int main()
{   
   /* UNCOMMENT BELOW if you want to set the time from the terminal. */
/*
    ftdi.printf("Enter current date and time:\r\n");
    ftdi.printf("YYYY MM DD HH MM SS[enter]\r\n\r\n");    
    ftdi.scanf("%d %d %d %d %d %d", &t.tm_year, &t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min, &t.tm_sec);
    ftdi.printf("-------------------------- \r\n");
    
    t.tm_year = t.tm_year - 1900;   // adjust for tm structure required values
    t.tm_mon = t.tm_mon - 1;
    
    set_time(mktime(&t));           // set the time
*/  

    /* UNCOMMENT BELOW if you want to set time manually */
/*       
    t.tm_year = 2015;     // current year
    t.tm_mon = 7;         // current month
    t.tm_mday = 7;        // current day
    t.tm_hour = 15;       // current hour
    t.tm_min = 16;        // current minute
    t.tm_sec = 0;         // current second
    
    t.tm_year = t.tm_year - 1900;   // adjust for tm structure required values
    t.tm_mon = t.tm_mon - 1;
    
    set_time(mktime(&t));           // set the time
*/
      
    /* Once the time is set, if there is a battery (3V) connected to VB pin and GND, RTC will remember the exact time. */
    
    while(1) 
    {  
        time_t seconds = time(NULL);
        
        if(button.read()==0)          // if the button is pressed
        {   
            while(button.read()==0);  // wait until release
            wait_ms(20);              // button debounce
            count++;                  // count up
            
            FILE* Logfile = fopen ("/local/log.txt","a");                                  // open file for appending  
            
            ftdi.printf("Time: %s \rButton count: %d \r\n",ctime(&seconds),count);         // send data to terminal
            ftdi.printf("-------------------------- \r\n");
            
            fprintf(Logfile, "Time: %s \rButton count: %d \r\n",ctime(&seconds),count);    // save data to log.txt file
            fprintf(Logfile, "-------------------------- \r\n");
            fclose(Logfile);  
        }   
        ledCounter(count);         // display the count as binary
    }
}